How strong is Ren Wo Xing? Xiang Wentian who is half to a full level below him is already pretty impressive, creating imprints in the floor with his feet while speaking and casually booting around a horse's corpse. He in turn is well above someone like Yue Buqun, who has shown some pretty sophisticated inner strength and being able to transmit it through the air seemingly.
Chongxu who has more or less mastered Taiji sword admittedly is below Ren, while Fang Zheng who mastered Yi Jinjing is seemingly a bit superior to him.
To start off discussion, I'll propose that he is at LOCH Qiu Qianren level.